surface phenomena
Recently Published Documents


TOTAL DOCUMENTS

728
(FIVE YEARS 66)

H-INDEX

40
(FIVE YEARS 4)

2021 ◽  
Vol 13 (4) ◽  
pp. 533-534
Author(s):  
Margarita N. Rodnikova ◽  
◽  
George G. Malenkov ◽  

Provided information about the deceased Georgy Aleksandrovich Martynov - Doctor of Physical and Mathematical Sciences, Professor, Chief Researcher of the Laboratory of Surface Forces of the A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences, a prominent specialist in the field of the theory of liquid state and surface phenomena: basic biographical data, training at the Faculty of Physics of Lomonosov Moscow State University, work at the Institute of Building Physics, defense of candidate (technical) and doctoral (physical and mathematical) dissertations, authorship of more than two hundred scientific papers, three monographs, membership in academic councils, participation and organization of Russian and international conferences and seminars, editorial staff in scientific journals, leadership of doctoral and master's theses.


Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6762
Author(s):  
Mirosław Cholewa ◽  
Tomasz Wróbel ◽  
Czesław Baron ◽  
Marcin Morys

The paper discusses a potential composite produced using the casting method, where the matrix is gray cast iron with flake graphite. The reinforcement is provided by granular carborundum (β-SiC). The article presents model studies aimed at identifying the phenomena at the contact boundary resulting from the interaction of the liquid matrix with solid reinforcement particles. The scope of the research included, primarily, the metallographic analysis of the microstructure of the resulting composite, carried out by using light (LOM) and scanning electron (SEM) microscopy with energy dispersive X-ray spectroscopy (EDS) analysis. The occurrence of metallic phases in the boundary zone was indicated, the contents and morphology of which can be optimized in order to achieve favorable functional properties, mainly the tribological properties of the composite. In addition, the results obtained confirm the possibility of producing similar composites based on selected iron alloys.


2021 ◽  
Vol 15 (1-2) ◽  
pp. 1-29
Author(s):  
Axel Pichler ◽  
Nils Reiter

Abstract The present article discusses and reflects on possible ways of operationalizing the terminology of traditional literary studies for use in computational literary studies. By »operationalization«, we mean the development of a method for tracing a (theoretical) term back to text-surface phenomena; this is done explicitly and in a rule-based manner, involving a series of substeps. This procedure is presented in detail using as a concrete example Norbert Altenhofer’s »model interpretation« (Modellinterpretation) of Heinrich von Kleist’s The Earthquake in Chile. In the process, we develop a multi-stage operation – reflected upon throughout in terms of its epistemological implications – that is based on a rational-hermeneutic reconstruction of Altenhofer’s interpretation, which focuses on »mysteriousness« (Rätselhaftigkeit), a concept from everyday language. As we go on to demonstrate, when trying to operationalize this term, one encounters numerous difficulties, which is owing to the fact that Altenhofer’s use of it is underspecified in a number of ways. Thus, for instance, and contrary to Altenhofer’s suggestion, Kleist’s sentences containing »relativizing or perspectivizing phrases such as ›it seemed‹ or ›it was as if‹« (Altenhofer 2007, 45) do by no means, when analyzed linguistically, suggest a questioning or challenge of the events narrated, since the unreal quality of those German sentences only relates to the comparison in the subordinate clause, not to the respective main clause. Another indicator central to Altenhofer’s ascription of »mysteriousness« is his concept of a »complete facticity« (lückenlose Faktizität) which »does not seem to leave anything ›open‹« (Altenhofer 2007, 45). Again, the precise designation of what exactly qualifies facticity as »complete« is left open, since Kleist’s novella does indeed select for portrayal certain phenomena and actions within the narrated world (and not others). The degree of factuality in Kleist’s text may be higher than it is in other texts, but it is by no means »complete«. In the context of Altenhofer’s interpretation, »complete facticity« may be taken to mean a narrative mode in which terrible events are reported using conspicuously sober and at times drastic language. Following the critical reconstruction of Altenhofer’s use of terminology, the central terms and their relationship to one another are first explicated (in natural language), which already necessitates intensive conceptual work. We do so implementing a hierarchical understanding of the terms discussed: the definition of one term uses other terms which also need to be defined and operationalized. In accordance with the requirements of computational text analysis, this hierarchy of terms should end in »directly measurable« terms – i. e., in terms that can be clearly identified on the surface of the text. This, however, leads to the question of whether (and, if so, on the basis of which theoretical assumptions) the terminology of literary studies may be traced back in this way to text-surface phenomena. Following the pragmatic as well as the theoretical discussion of this complex of questions, we indicate ways by which such definitions may be converted into manual or automatic recognition. In the case of manual recognition, the paradigm of annotation – as established and methodologically reflected in (computational) linguistics – will be useful, and a well-controlled annotation process will help to further clarify the terms in question. The primary goal, however, is to establish a recognition rule by which individuals may intersubjectively and reliably identify instances of the term in question in a given text. While it is true that in applying this method to literary studies, new challenges arise – such as the question of the validity and reliability of the annotations –, these challenges are at present being researched intensively in the field of computational literary studies, which has resulted in a large and growing body of research to draw on. In terms of computer-aided recognition, we examine, by way of example, two distinct approaches: 1) The kind of operationalization which is guided by precedent definitions and annotation rules benefits from the fact that each of its steps is transparent, may be validated and interpreted, and that existing tools from computational linguistics can be integrated into the process. In the scenario used here, these would be tools for recognizing and assigning character speech, for the resolution of coreference and the assessment of events; all of these, in turn, may be based on either machine learning, prescribed rules or dictionaries. 2) In recent years, so-called end-to-end systems have become popular which, with the help of neural networks, »infer« target terms directly from a numerical representation of the data. These systems achieve superior results in many areas. However, their lack of transparency also raises new questions, especially with regard to the interpretation of results. Finally, we discuss options for quality assurance and draw a first conclusion. Since numerous decisions have to be made in the course of operationalization, and these, in practice, are often pragmatically justified, the question quickly arises as to how »good« a given operationalization actually is. And since the tools borrowed from computational linguistics (especially the so-called inter-annotator agreement) can only partially be transferred to computational literary studies and, moreover, objective standards for the quality of a given implementation will be difficult to find, it ultimately falls to the community of researchers and scholars to decide, based on their research standards, which operationalizations they accept. At the same time, operationalization is the central link between the computer sciences and literary studies, as well as being a necessary component for a large part of the research done in computational literary studies. The advantage of a conscious, deliberate and reflective operationalization practice lies not only in the fact that it can be used to achieve reliable quantitative results (or that a certain lack of reliability at least is a known factor); it also lies in its facilitation of interdisciplinary cooperation: in the course of operationalization, concrete sets of data are discussed, as are the methods for analysing them, which taken together minimizes the risk of misunderstandings, »false friends« and of an unproductive exchange more generally.


2021 ◽  
Author(s):  
Xipeng Wang ◽  
Bo Li ◽  
Mengmeng Li ◽  
Yilong Han

Abstract Analogous to surface premelting, we propose that a crystal surface can undergo a pre-solid-solid transition, i.e. developing a thin polymorphic crystalline layer before reaching the solid-solid transition temperature if two crystals can form a low-energy coherent interface. We confirm this in simulations and colloid experiments at single-particle resolution. The power-law increase of surface layer thickness is analogous to premelting. Different kinetics and reversibilities of surface-crystal growth are observed in various systems. Surface crystals exist not only under thermal equilibrium, but also during melting, crystallization, and grain coarsening. Furthermore, the premelting and pre-solid-solid transition can coexist, resulting double surface wetting layers. We hypothesize that such surface phenomena exist in atomic and molecular crystals, which provide a novel way to tune material properties.


2021 ◽  
pp. 51-56
Author(s):  
M.K. Ismayilova

The aim of this paper to study the effects of γ-rays on nanostructured Na-bentonite clay from Alpoid deposit. The effect of high doses (up to 256 kGy) of γ-radiation on the short-range structural organization in montmorillonite was studied using infrared spectroscopy. Significant change attributable to irradiation was observed at dose of 57 kGy. No significant changes were observed after 57 kGy of γ-radiation. A small variation in the water content was noted but it is not systematic. The results show that the montmorillonite structure can accumulate high doses of radiation with damage. The modifications most likely to be generated by the radiation were expected to be within the silicate layers. The morphology of the nanocomposites was studied with scanning electron microscopy. In this paper, the effects of ionizing radiation on the Na-bentonite clay investigated by FT-IR method. These spectra show the suitability of FT-IR study of mineral surfaces and the changes in the spectra brought about by the surface phenomena.


2021 ◽  
Vol 62 (1) ◽  
pp. 239-264
Author(s):  
Joachim Küpper

On the Historical Novel in France and Italy: Balzac, Flaubert, and Manzoni Created by Walter Scott, the historical novel owes its immense and persistent success to the fact that it foregrounds an impression linked to the rapid political, social, and economic change at the end of the 18th century: individual fate may be contingent on either the will of a god or the inscrutable lottery of genes; but it is certainly dependent on historical circumstances, as well as an individual’s ability to cope with them. – This essay discusses three prominent 19th-century paradigms of the genre. Focusing primarily on Le Père Goriot, L’Éducation sentimentale, and I promessi sposi, it argues that each of the texts encapsulates conceptualizations of history that remain dominant well unto the present day. Balzac offers a (religiously based) historical optimism. Flaubert’s radical pessimism is grounded in the belief that all historical change is nothing but a series of ultimately irrelevant surface phenomena. Manzoni’s moderate political scepticism suggests that a rigorously rational approach to the problems emerging as a result of historical events may not be able to make this world a better place but might still help to prevent major catastrophes.


Scanning ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Xiao Zhang ◽  
Rongqing Ma ◽  
Ruoyi Gao

Ancient buildings have various geometric and material changes caused by the historical and natural factors, and their comprehensive detection has also been a more important challenge. This way, in this paper, a flexible, scientific approach from terrestrial laser scanning and hyperspectral imaging is provided for this issue. It is possible to flexibly and accurately detect some potential crisis, which cannot be found in some surface phenomena of historical buildings. Furthermore, one of the main characteristic of this method is that the time and place of the two data acquisition need not be limited, but they can be accurately fused. Another one of the main features is that the fusion data can synthetically detect geometric and material changes of historical buildings. This method was applied to the case study of the Beijing Tianningsi Tower, an extremely dazzling pearl of the Chinese Buddhist pagoda, on which the signs of deformation and restoration were found in the tower shape and in the tower-body sculpture. It was possible to assess the typical physical, chemical, and biological changes of historical buildings, to provide scientific basis for comprehensive research. The results demonstrate that this method is feasible and applicable for detecting changes of ancient buildings and is applied to similar research using more analytical methods for multisource data.


Sign in / Sign up

Export Citation Format

Share Document